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Corona and Tracking Conditions - IRINFO.org· Sounds above the normal range of human hearing (20 Hz to 20 kilo-Hertz (kHz)), are typically thought of as ultrasonic. A frequency range between 20 kHz to 40 kHz generally covers all of the ultrasonic applications used for predictive maintenance applications; leak detection, steam traps, bearings and lubrication, and electrical discharge.

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